Johnson Controls FX-PCX2721 Installation Instructions Manual

Brand: Johnson Controls

Model: FX-PCX2721

Type: Installation Instructions Manual

This manual is also suitable for

FX-PCX3721

Application

The FX-PCX2721 controller is part of the Facility Explorer

FX-PC Series Programmable Controller family. FX-PCXs

expand the number of input/output points connected to

either an FX-PCA, FX-PCG, FX-PCV programmable

controller or to a supervisory controller to monitor and

control a wide variety of HVAC equipment.

FX-PCX operate on an RS-485 BACnet®

Master-Slave/Token-Passing (MS/TP) Bus as BACnet

Application Specific Controllers (B-ASCs) and integrate

into Johnson Controls® and third-party BACnet systems.

Note: At FX-PCT Release 10.1, a new capability was

introduced allowing FX-PCVs, FX-PCGs, and

FX-PCAs to communicate by using either the

BACnet or the N2 field bus networking protocol.

The operation of the FX-PCX Input/Output Module

is not affected by the selection of the BACnet or

the N2 protocol in the host controller.

North American Emissions

Compliance

Canada

This Class (A) digital apparatus meets all the

requirements of the Canadian Interference-Causing

Equipment Regulations.

Cet appareil numérique de la Classe (A) respecte toutes

les exigences du Règlement sur le matériel brouilleur

du Canada.

United States

This equipment has been tested and found to comply

with the limits for a Class A digital device pursuant to

Part 15 of the FCC Rules. These limits are designed to

provide reasonable protection against harmful

interference when this equipment is operated in a

commercial environment. This equipment generates,

uses, and can radiate radio frequency energy and, if not

installed and used in accordance with the instruction

manual, may cause harmful interference to radio

communications. Operation of this equipment in a

residential area may cause harmful interference, in which

case the users will be required to correct the interference

at their own expense.

Installation

Observe these guidelines when installing a controller:

• Transport the controller in the original container to

minimize vibration and shock damage.

• Verify that all parts shipped with the controller.

• Do not drop the controller or subject it to physical

shock.

Parts Included

• one controller with removable terminal blocks (Power

and SA/FC bus are removable)

• one installation instructions sheet

Materials and Special Tools Needed

• three fasteners appropriate for the mounting surface

(M4 screws or #8 screws)

• one 20 cm (8 in.) or longer piece of 35 mm DIN rail

and appropriate hardware for DIN rail mount (only)

• small straight-blade screwdriver for securing wires in

the terminal blocks

Mounting

Observe these guidelines when mounting an FX-PCX

controller:

• Ensure the mounting surface can support the

controller, DIN rail, and any user-supplied enclosure.

• Mount the controller horizontally on 35 mm DIN rail

whenever possible.

• Mount the controller in the proper mounting position.

• Mount the controller on a hard, even surface

whenever possible in wall-mount applications.

• Use shims or washers to mount the controller securely

and evenly on the mounting surface.

• Mount the controller in an area free of corrosive

vapors and observe the Ambient Conditions

requirements in Table 10.

• Provide for sufficient space around the controller for

cable and wire connections for easy cover removal

and good ventilation through the controller (50 mm

[2 in.] minimum on the top, bottom, and front of the

controller).

1FX-PCX2721 Expansion Input/Output Module Installation Instructions

FX-PCX2721 Expansion Input/Output Module Installation

Instructions

FX-PCX2721-0

Part No. 24-10144-173, Rev. F

Issued August 2018

Refer to

the QuickLIT website for the most up-to-date version of this document.

• Do not mount the controller on surfaces prone to

vibration, such as duct work.

• Do not mount the controller in areas where

electromagnetic emissions from other devices or

wiring can interfere with controller communication.

Observe these additional guidelines when mounting a

controller in a panel or enclosure:

• Mount the controller so that the enclosure walls do

not obstruct cover removal or ventilation through the

controller.

• Mount the controller so that the power transformer

and other devices do not radiate excessive heat to

the controller.

• Do not install the controller in an airtight enclosure.

Figure 1: Controller Mounting Positions

DIN Rail Mount Applications

Mounting the FX-PCX controller horizontal on 35 mm DIN

rail is the preferred mounting method.

To mount a controller on 35 mm DIN rail:

1. Securely mount a 20 cm (8 in.) or longer section of

35 mm DIN rail horizontal and centered in the desired

space so that the controller mounts in the horizontal

position shown in Figure 1.

2. Pull the two bottom mounting clips outward from the

controller to the extended position (Figure 2).

3. Hang the controller on the DIN rail by the hooks at

the top of the (DIN rail) channel on the back of the

controller (Figure 2), and position the controller snugly

against the DIN rail.

4. Push the bottom mounting clips inward (up) to secure

the controller on the DIN rail.

To remove the controller from the DIN rail, pull the

bottom mounting clips out to the extended position

and carefully lift the controller off the DIN rail.

2FX-PCX2721 Expansion Input/Output Module Installation Instructions

Wall Mount Applications

To mount an FX-PCX controller directly on a wall or other

flat vertical surface:

1. Pull the two bottom mounting clips outward and

ensure they are locked in the extended position, as

shown in Figure 2.

2. Mark the mounting hole locations on the wall using

the dimensions in Figure 2 and one of the mount

positions shown in Figure 1. Or hold the controller up

to the wall or surface in a proper mount position and

mark the hole locations through the mounting clips.

3. Drill holes in the wall or surface at the marked

locations, and insert appropriate wall anchors in the

holes (if necessary).

4. Hold the controller in place, and insert the screws

through the mounting clips and into the holes (or

anchors). Carefully tighten all of the screws.

Important: Do not overtighten the mounting screws.

Overtightening the screws may damage

the mounting clips.

Figure 2: Back of Controller Showing Extended

Mounting Clips, DIN Rail Channel, and Mounting

Dimensions, mm (in.)

3FX-PCX2721 Expansion Input/Output Module Installation Instructions

Figure 3: FX-PCX2721 Physical Features

Table 1: FX-PCX2721 Physical Features Callouts and Descriptions

Physical Feature: Description and ReferencesCallout

Analog Outputs (AOs) Terminal Block. (See Table 3)

Mounting Clip (Three Total)2

Device Address DIP Switch Block (See Setting the Device Addresses)

24 VAC, Class 2 Supply Power Terminal Block (See Supply Power Terminal Block)

Cover Lift Tab (One of Two) (See Removing the Controller Cover)

Sensor Actuator (SA) Bus / Field Controller (FC) Bus Terminal Block (See SA/FC Bus Terminal Block)

Universal Inputs (UIs) Terminal Block (See Table 3)

LED Status Indicators (See Table 8)

Sensor Actuator (SA) Bus or Field Controller (FC) Bus Port (RJ-12 6-pin Modular Jack) (See SA/FC Bus Port)

4FX-PCX2721 Expansion Input/Output Module Installation Instructions

Wiring

Risk of Electric Shock: Disconnect or isolate all power

supplies before making electrical connections. More than

one disconnect or isolation may be required to

completely de-energize equipment. Contact with

components carrying hazardous voltage can cause

electric shock and may result in severe personal injury

or death.

Avertissement: Risque de décharge électrique:

Débrancher ou isoler toute alimentation avant de réaliser

un branchement électrique. Plusieurs isolations et

débranchements sont peut-être nécessaires pour

-couper entièrement l'alimentation de l'équipement. Tout

contact avec des composants conducteurs de tensions

dangereuses risque d'entraîner une décharge électrique

et de provoquer des blessures graves, voire mortelles.

Risk of Property Damage: Do not apply power to the

system before checking all wiring connections. Short

circuited or improperly connected wires may result in

permanent damage to the equipment.

Mise En Garde: Risque de dégâts matériels: Ne pas

mettre le système sous tension avant d'avoir vérifié tous

les raccords de câblage. Des fils formant un court-circuit

ou connectés de façon incorrecte risquent

d'endommager irrémédiablement l'équipement.

Important: Do not exceed the controller electrical

ratings. Exceeding controller electrical

ratings can result in permanent damage to

the controller and void any warranty.

Important: Use copper conductors only. Make all wiring

in accordance with local, national, and

regional regulations.

Important: Electrostatic discharge can damage

controller components. Use proper

electrostatic discharge precautions during

installation, setup, and servicing to avoid

damaging the controller.

For detailed information on configuring and wiring an

MS/TP Bus, FC bus, and SA bus, refer to the FX-PC

Series Controllers MS/TP Communications Bus Technical

Bulletin (LIT-12011670) or MS/TP Communications Bus

for BCM System Technical Bulletin (LIT-12011908).

Terminal Blocks and Bus Ports

See Figure 3 for terminal block and bus port locations on

the controller. Observe the following guidelines when

wiring a controller.

Input and Output Terminal Blocks

All of the input terminal blocks are mounted on the bottom

of the controller and the output terminal blocks are

mounted on the top of the controller. See Table 3 for more

information about I/O terminal functions, requirements,

and ratings.

SA/FC Bus Terminal Block

An FX-PCX controller can be connected to a

Sensor/Actuator (SA) bus or a Field Controller (FC) bus,

but not to both buses simultaneously. The SA/FC bus

terminal block is a removable, 4-terminal plug that fits

into a board-mounted jack.

When connecting the FX-PCX to an FC bus, wire the bus

terminal block plugs on the controller, and the other

controllers in a daisy-chain configuration using 3-wire

twisted, shielded cable as shown in Figure 4. See Table

5 for more information.

Figure 4: FC Bus Terminal Block Wiring

When connecting the FX-PCX to an SA bus, wire the bus

terminal block plugs on the controller and other SA bus

devices in a daisy-chain configuration using 4-wire

twisted, shielded cable as shown in Figure 5. See Table

3 for more information.

5FX-PCX2721 Expansion Input/Output Module Installation Instructions

Figure 5: SA Bus Terminal Block Wiring

Note: The SA PWR/SHLD terminal does not supply 15

VDC. The SA PWR/SHLD terminal is isolated and

can be used to connect (daisy chain) the 15 VDC

power leads on the SA bus (Figure 5) or the cable

shields on the FC bus (Figure 4). The SA bus

supervisor supplies 15 VDC to devices on the SA

bus requiring power.

SA/FC Bus Port

The SA/FC bus port on the front of the controller is an

RJ-12, 6-position modular jack that provides a connection

for devices on the SA bus, a Bluetooth® Commissioning

Converter, Zigbee® wireless dongle, or an FX-ZFR1811

Wireless Router (depending on which bus the FX-PCX

is operating on).

The SA/FC bus port is connected internally to the SA/FC

bus terminal block. See Table 5 for more information.

The SA/FC bus Port pin assignment is shown in Figure

Figure 6: Pin Number Assignments for Sensor, SA

Bus and FC Bus Ports on Controllers

Supply Power Terminal Block

The 24 VAC supply power terminal block is a gray,

removable, 3-terminal plug that fits into a board-mounted

jack on the top right of the controller.

Wire the 24 VAC supply power wires from the transformer

to the HOT and COM terminals on the terminal plug as

shown in Figure 7. The middle terminal on the supply

power terminal block is not used. See Table 5 for more

information about the Supply Terminal Block.

Figure 7: 24 VAC Supply Power Terminal Block Wiring

Note: The supply power wire colors may be different on

transformers from other manufacturers. Refer to

the transformer manufacturer’s instructions and

the project installation drawings for wiring details.

Important: Connect 24 VAC supply power to the

controller and all other network devices so

that transformer phasing is uniform across

the network devices. Powering network

devices with uniform 24 VAC supply power

phasing reduces noise, interference, and

ground loop problems. The controller does

not require an earth ground connection.

Wireless Network Applications

The controller can also be installed in a wireless

application using an FX-ZFR1811 Wireless Field Bus

Router.

To configure a controller for use with the FX-ZFR Series

Wireless Field Bus system:

Note: FX-PCXs can talk wirelessly on the FC bus only.

6FX-PCX2721 Expansion Input/Output Module Installation Instructions

1. Connect the FX-ZFR1811 Wireless Field Bus Router

to the FC bus port (RJ-12 modular jack) on the front

of the controller.

2. Ensure that the controller's device address DIP

switches are set to the correct device address. See

Setting the Device Addresses.

3. Set DIP switch 128 to ON, which enables wireless

operation on the controller.

For more information on installing a controller in a

wireless configuration, refer to the FX-ZFR Wireless

Field Bus Router Installation Instructions (Part No.

24-10325-29).

Termination Details

A set of Johnson Controls® termination diagrams provides details for wiring inputs and outputs to the controllers.

See the figures in this section for the applicable termination diagrams.

Table 2: Termination Details

Termination DiagramsType of

Input/Output

Type of Field

Device

UITemperature Sensor

UIVoltage Input -

External Source

UIVoltage Input -

Internal Source

UIVoltage Input

(Self-Powered)

UICurrent Input -

External Source

(Isolated)

7FX-PCX2721 Expansion Input/Output Module Installation Instructions

Table 2: Termination Details

Termination DiagramsType of

Input/Output

Type of Field

Device

UICurrent Input -

Internal Source (2

wire)

UICurrent Input -

Internal Source (3

wire)

UICurrent Input -

External Source (in

Loop)

UIFeedback from

EPP-1000

UIDry Contact (Binary

Input)

AO0–20 VDC Output to

Actuator (External

Source)

8FX-PCX2721 Expansion Input/Output Module Installation Instructions

Table 2: Termination Details

Termination DiagramsType of

Input/Output

Type of Field

Device

AO0–10 VDC Output to

Actuator (Internal

Source)

AOAnalog Output

(Current)

AO4–20 mA Output to

Actuator

AOVoltage (Analog

Output)

AO4–20 mA Output to

Actuator

9FX-PCX2721 Expansion Input/Output Module Installation Instructions

Terminal Wiring Guidelines,

Functions, Ratings, and

Requirements

Input and Output Wiring Guidelines

Table 3 provides information and guidelines about the

functions, ratings, and requirements for the controller

input and output terminals; and references guidelines for

determining proper wire sizes and cable lengths.

In addition to the wiring guidelines in Table 3, observe

these guidelines when wiring controller inputs and

outputs:

• Run all low-voltage wiring and cables separate from

high-voltage wiring.

• All input and output cables, regardless of wire size or

number of wires, should consist of stranded, insulated,

and twisted copper wires.

• Shielded cable is not required for input or output

cables.

• Shielded cable is recommended for input and output

cables that are exposed to high electromagnetic or

radio frequency noise.

• Inputs/outputs with cables less than 30 m (100 ft)

typically do not require an offset in the software setup.

Cable-runs over 30 m (100 ft) may require an offset

in the input/output software setup.

Table 3: Controller Terminal Blocks, Functions, Ratings, Requirements, and Cables

Determine Wire Size and

Maximum Cable Length

Function, Ratings, RequirementsTerminal

Label

Terminal Block

Label

Same as (Universal) INn

Note: Use 3-wire cable for

devices that source power from

the +15V terminal.

15 VDC Power Source for active (3-wire) input devices

connected to the Universal INn terminals.

Provides 100 mA total current

+15 VUNIVERSAL

(Inputs)

See Guideline A in Table 4.

Analog Input - Voltage Mode (0–10 VDC)

10 VDC maximum input voltage

Internal 75k ohm Pull-down

INn

See Guideline B in Table 4.

Analog Input - Current Mode (4–20 mA)

Internal 100 ohm load impedance

Note: A current loop fail-safe jumper can be positioned to

maintain a closed 4 to 20 mA current loop, even when the

power to the controller is interrupted or off. See UI Current

Loop Jumpers.

See Guideline A in Table 4.

Analog Input - Resistive Mode (0–600k ohm)

Internal 12 V. 15k ohm pull up

Qualified Sensors: 0-2k ohm potentiometer, RTD (1k Nickel

[Johnson Controls® sensor], 1k Platinum, and A99B Silicon

Temperature Sensor) Negative Temperature Coefficient

(NTC) Sensor (10k Type L, 10k JCI Type II, 2.252k Type

II)

See Guideline A in Table 4.

Binary Input - Dry Contact Maintained Mode

1 second minimum pulse width

Internal 12 V. 15k ohm pull up

Same as (Universal) INn

Universal Input Common for all Universal Input terminals

Note: All Universal ICOMn terminals share a common,

which is isolated from all other commons.

ICOMn

10FX-PCX2721 Expansion Input/Output Module Installation Instructions

Table 3: Controller Terminal Blocks, Functions, Ratings, Requirements, and Cables

Determine Wire Size and

Maximum Cable Length

Function, Ratings, RequirementsTerminal

Label

Terminal Block

Label

See Guideline C in Table 4.

Analog Output - Voltage Mode (0–10 VDC)

10 VDC maximum output voltage

10 mA maximum output current

Required an external load of 1,000 ohm or more.

Note: The Analog Output (AO) operates in the Voltage

Mode when connected to devices with impedances greater

than 1,000 ohm. Devices that drop below 1,000 ohm may

not operate as intended for Voltage Mode applications.

OUTn

ANALOG

(Outputs)

Analog Output - Current Mode (4–20 mA)

Requires an external load between 0 and 300 ohm.

Note: The Analog Output (AO) operates in the Current

Mode when connected to devices with impedances less

than 300 ohm. Devices that exceed 300 ohm may not

operate as intended for Current Mode applications.

Analog Output Signal Common for all Analog OUT

terminals.

Note: All Analog Output Common terminals (OCOMn) share

a common, which is isolated from all other commons.

OCOMn

See Table 4 to determine wire size and cable lengths for cables.

Cable and Wire Length

Guidelines

Table 4 defines cable length guidelines for the various

wire sizes that may be used for wiring low-voltage (<30V)

input and outputs.

Table 4: Cable Length Guidelines for Recommended Wire Sizes for Low-Voltage (<30V) Inputs and Outputs

AssumptionsMaximum Cable

Length and Type

Wire Size/Gauge and TypeGuideline

100 mV maximum voltage drop

Depending on cable and the connected input

or output device, you may have to define an

offset in the setup software for the input or

output point.

457 m (1,500 ft) twisted

wire

1.5 mm

(18 AWG) stranded copper

297 m (975 ft) twisted wire0.8 mm (20 AWG) stranded copper

183 m (600 ft) twisted wire0.6 mm (22 AWG) stranded copper

107 m (350 ft) twisted wireN/A (24 AWG) stranded copper

100 mV maximum voltage drop

Depending on cable and the connected input

or output device, you may have to define an

offset in the setup software for the input or

output point.

229 m (750 ft) twisted wire

1.5 mm

(18 AWG) stranded copper

137 m (450 ft) twisted wire0.8 mm (20 AWG) stranded copper

91 m (300 ft) twisted wire0.6 mm (22 AWG) stranded copper

61 m (200 ft) twisted wireN/A (24 AWG) stranded copper

N/A

See Figure 8 to determine

cable length. Use twisted

wire cable.

See Figure 8 to select wire size/gauge.

Use stranded copper wire.

11FX-PCX2721 Expansion Input/Output Module Installation Instructions

Maximum Cable Length versus

Load Current

Use Figure 8 to estimate the maximum cable length

relative to the wire size and the load current (in mA) when

wiring inputs and outputs.

Note: Figure 8 applies to low-voltage (<30V) inputs and

outputs only.

Figure 8: Maximum Wire Length for Low-Voltage (<30V) Inputs and Outputs by Current and Wire Size

SA/FC Bus and Supply Power

Wiring Guidelines

Table 5 provides information about the functions, ratings,

and requirements for the communication bus and supply

power terminals; and guidelines for wire sizes, cable

types, and cable lengths when wiring the controller's

communication buses and supply power.

In addition to the guidelines in Table 5, observe these

guidelines when wiring an SA or FC bus and the 24 VAC

supply power:

• Run all low-voltage wiring and cables separate from

high-voltage wiring.

• All SA and FC bus cables, regardless of wire size,

should be twisted, insulated, stranded copper wire.

• Shielded cable is strongly recommended for all SA

and FC bus cables.

•

Refer to the FX-PC Series Controllers MS/TP

Communications Bus Technical Bulletin

(LIT-12011670) or MS/TP Communications Bus for

BCM System Technical Bulletin (LIT-12011908) for

detailed information regarding wire size and cable

length requirements for the SA and FC buses.

12FX-PCX2721 Expansion Input/Output Module Installation Instructions

Table 5: Communications Bus and Supply Power Terminal Blocks, Functions, Ratings, Requirements, and Cables

Recommended Cable Type

Function, Electrical Ratings/RequirementsTerminal

Labels

Terminal

Block/Port

Label

FC Bus: 0.6 mm (22 AWG) stranded, 3-wire

twisted, shielded cable recommended.

SA Bus: 0.6 mm (22 AWG) stranded, 4-wire

(2 twisted-pairs), shielded cable

recommended.

Note: On the SA Bus, the + and - wire are

one twisted pair, and the COM and SA PWR

are the second twisted pair of wires.

FC or SA Bus Communications+

FCBUS

SABUS

Signal Reference (Common) for FC or SA Bus

communications

COM

SHLD on FC Bus: Isolated terminal (optional shield drain

connection

SAP WR on SA Bus: 15 VDC power lead connection

Note: The SA PWR terminal on an FX-PCX37 controller

does not supply 15 VDC. The SA bus supervisor supplies

15 VDC to devices on the SA bus requiring power.

SHLD

SAPWR

Bluetooth Commissioning Converter

retractable cable or 24 AWG 3-pair CAT 3

Cable <30.5 m (100 ft)

RJ-12 6-Position Modular Connector provides:

FC or SA Bus Communications

FC or SA Bus Signal Reference and 15 VDC Common

Commissioning Converter or FX-ZFR1811 Wireless Router

(Maximum total current draw for SA Bus is 240 mA.)

SA/FC BUS

(Port)

0.8 mm to 1.5 mm

(18 AWG) 2-wire

24 VAC Power Supply - Hot

Supplies 20-30 VAC (Nominal 24 VAC)

HOT24~

24 VAC Power Supply - Common

(Isolated from all other Common terminals on controller.)

COM

See Table 4 to determine wire size and cable lengths for cables.

2 The SA Bus and FC Bus wiring recommendations in this table are for MS/TP bus communications at 38,400 baud. For more

information, refer to the FX-PC Series Controllers MS/TP Communications Bus Technical Bulletin (LIT-12011670) or MS/TP

Communications Bus for BCM System Technical Bulletin (LIT-12011908).

Setup and Adjustments

Setting the Device Addresses

FX-PCX controllers are master devices on MS/TP (SA

or FC) buses. Before operating controllers on a bus, you

must set a valid and unique device address for each

controller on the bus. You set a controller's device

address by setting the positions of the switches on the

DIP switch block at the top of the controller (Figure 3).

Device addresses 4 through 127 are the valid addresses

for these controllers.

The DIP switch block has eight switches numbered 128,

64, 32, 16, 8, 4, 2, and 1. Switches 64 through 1 are

device address switches. Switch 128 is a mode switch

that enables a controller to operate on an FX-ZFR Series

Wireless Field Bus. Switch 128 must be set to off for all

hard-wired SA and FC bus applications. Set switch 128

to ON for wireless FC bus applications only.

Figure 9: Device Address DIP Switch Block Set to

Address 21

Note: Controllers ship with switch 128 ON and the

remaining address switches off rendering the

controllers wired slave devices, which do not

operate on MS/TP buses, but will not interfere

with bus operation. Set a valid and unique device

address on the controller before applying power

to the controller on the bus.

To set the device addresses on FX-PCX controllers:

13FX-PCX2721 Expansion Input/Output Module Installation Instructions

1. Set all of the switches on the address DIP switch

block (128 through 1) to off.

2. Set one or more of the seven address switches (64

though 1) to ON, so that the sum of the switch

numbers set to ON equals the intended device

address. See Table 6 for valid device addresses.

Set the highest number switch that is less than or

equal to the intended device address to ON. Then

continue setting lower numbered switches until the

total equals the intended address. For example, if the

intended device address is 21, set switch 16 to ON

first, then set switch 4 ON, followed by switch 1

(16+4+1= 21).

3. Set switch 128 to ON only for controllers on an

FX-ZFR Series Wireless Field Bus application. For

all hard-wired SA and FC bus applications, ensure

that switch 128 is set to Off.

Note: Do not connect a controller with switch 128

set to ON to an active (hard-wired) SA or FC

bus. When a controller with switch 128 is set

to ON and a device address from 4 to 127 is

connected to a wired field bus, the entire field

bus is rendered inoperable until the controller

is disconnected or switch 128 is set to Off.

Refer to the FX-ZFR Series Wireless Field Bus

System Technical Bulletin (LIT-12011660) for more

information on device addresses in wireless

applications.

4. Set a unique and sequential device address for each

of the controllers connected on the SA or FC bus

starting with device address 4.

To ensure the best bus performance, set sequential

device addresses with no gaps in the device address

range (4, 5, 6, 7, 8, 9, and so on). The controllers do

not need to be physically connected on the bus in

their numerical device address order.

5. Write the controller's device address on the white

label below the DIP switch block on the controller's

cover.

Table 6 describes the FC bus and SA bus device

addresses for Johnson Controls® MS/TP

communications bus applications.

Refer to the FX-PC Series Controllers MS/TP

Communications Bus Technical Bulletin

(LIT-12011670) or MS/TP Communications Bus for

BCM System Technical Bulletin (LIT-12011908) for

more information on controller device addresses and

how to set them on MS/TP buses.

Table 6: SA/FC Bus Device Address Descriptions

Use on DescriptionDevice

Address

Reserved for FC Bus Supervisory Controller

(not for use on controllers).

(Switch

128 Off)

Reserved for peripheral devices (not for use

on controllers).

1 to 3

(Switch

128 Off)

Used for MS/TP master devices (controllers)

that are hardwired to an SA Bus or FC Bus.

4 to 127

(Switch

128 Off)

Reserved addresses for wired slave devices

(not for use on controllers).

Note: FX-PCX controllers ship with switch 128

ON and the remaining address switches OFF,

rendering the controllers wired slave devices,

which do not operate on MS/TP buses.

0 to 3

(Switch

128 ON)

Valid for MS/TP Master controllers on wireless

FC Buses only.

Note: Do not connect a controller with switch

128 ON to an active (hard-wired) SA or FC

Bus. When a controller with switch 128 ON

and a device address from 4 to 127 is

connected to a wired field bus, the entire field

bus is rendered inoperable until the controller

is disconnected or switch 128 is set to OFF.

4 to 127

(Switch

128 ON)

Removing the Controller Cover

Important: Electrostatic discharge can damage

controller components. Use proper

electrostatic discharge precautions during

installation, setup, and servicing to avoid

damaging the controller.

Important: Disconnect all power sources to the

controller before removing cover and

changing the position of any jumper or the

EOL switch on the controller. Failure to

disconnect power before changing a jumper

or EOL switch position can result in damage

to the controller and void any warranties.

The controller cover is held in place by four plastic latches

that extend from the base and snap into slots on the

inside of the housing cover.

To remove the controller cover:

1. Place your fingernails under the two cover lift tabs

(Figure 3) on the sides of the housing cover and

14FX-PCX2721 Expansion Input/Output Module Installation Instructions

gently pry the top of the cover away from the base to

release the cover from the two upper latches.

2. Pivot the top of the cover further to release it from the

lower two latches.

3. Replace the cover by placing it squarely over the

base, and then gently and evenly push the cover on

to the latches until they snap into the latched position.

Figure 10: Controller with Cover Removed Showing

EOL Switch and Jumper Positions

Setting the End-of-Line (EOL) Switch

Each controller has an EOL switch, which, when set to

ON, sets the controller as a terminating device on the

bus. See Figure 10 for the EOL switch location. The

default EOL switch position is Off.

Figure 11: End-of-Line Switch Positions

To set the EOL switch on a controller:

1. Determine the physical location of the controller on

the SA or FC bus.

2. Determine if the controller must be set as a

terminating device on the bus.

Note: The EOL termination rules for SA buses and

FC buses are different. Refer to the FX-PC

Series Controllers MS/TP Communications

Bus Technical Bulletin (LIT-12011670) or

MS/TP Communications Bus for BCM System

Technical Bulletin (LIT-12011908) for detailed

information regarding EOL termination rules

and EOL switch settings on SA and FC buses.

3. If the controller is a terminating device on the FC bus,

set the EOL switch to ON. If the controller is not a

terminating device on the bus, set the EOL switch to

Off.

When a controller is connected to power with its EOL

switch set to ON, the amber EOL LED on the

controller cover is lit.

UI Current Loop Jumpers

The Universal Input (UI) current loop fail-safe jumpers

are on the circuit board under the controller cover near

the UI terminals (Figure 10). When a UI is defined (in the

system software) as a 4 to 20 mA Analog Input and the

UI’s current loop jumper is in the Disabled (default)

position (Figure 12), the 4 to20 mA current loop circuit

opens whenever power to the controller is interrupted or

off.

Figure 12: Current Loop Jumper Positions

Setting the current loop jumper to the Enabled position

(Figure 12) connects an internal 100 ohm resistor across

the UI terminals, which maintains the 4 to 20 mA current

loop circuit even when power to the controller is

interrupted or off.

Important: Current Loop jumpers must be in the

Disabled (default) position for all UIs that

are not set up to operate as 4 to20 mA

analog inputs.

Table 7 identifies the current loop jumpers associated

with each UI on the FX-PCX2721 controller.

Table 7: FX-PCX2721 UI Inputs and Jumper Labels

Jumper Label on Circuit BoardUniversal Input

Label

J20IN1

J21IN2

J22IN3

J23IN4

J24IN5

J25IN6

15FX-PCX2721 Expansion Input/Output Module Installation Instructions

Table 7: FX-PCX2721 UI Inputs and Jumper Labels

Jumper Label on Circuit BoardUniversal Input

Label

J26IN7

J27IN8

Commissioning the Controllers

You commission controllers with the FX-PCT software,

either via a Bluetooth Commissioning Converter, a ZigBee

wireless dongle, or in BACnet® router mode when

connected to an FX supervisory controllers. Refer to the

Controller Tool Help (LIT-12011147) for detailed

information on commissioning controllers.

Troubleshooting the Controllers

Observe the Status LEDs on the front of the controller

and see Table 8 to troubleshoot the controller.

Table 8: Status LEDs and Descriptions of LED States

Description of LED StatesNormal LED

State

LED ColorLED Label

Off Steady = No Supply Power or the controller’s polyswitch/resettable fuse

is open. Check Output wiring for short circuits and cycle power to controller.

On Steady = Power Connected

On SteadyGreenPOWER

Off Steady = No Faults

On Steady = Device Fault; no application loaded; Main Code download

required, if controller is in Boot mode, or a firmware mismatch exists between

the FX-PCX and the FX-ZFR1811 Wireless Field Bus Router.

Blink - 2 Hz = Download or Startup in progress, not ready for normal operation

Off SteadyRedFAULT

Blink - 2 Hz = Data Transmission (normal communication)

Off Steady = No Data Transmission (N/A - auto baud not supported)

On Steady = Communication lost, waiting to join communication ring

Blink - 2 HzGreenSA/FC BUS

On Steady = EOL switch in ON position

Off Steady = EOL switch in Off position

Off (Except on

terminating

devices)

AmberEOL

Repair Information

If a controller fails to operate within its specifications,

replace the controller. For a replacement controller,

contact your Johnson Controls representative.

Accessories

See Table 9 for controller accessories ordering

information.

Table 9: Accessories Ordering Information

DescriptionProduct Code Number

Bluetooth Commissioning ConverterFX-BTCVT-1

Wireless Field Bus RouterFX-ZFR1811-0

Transformer, 120 VAC Primary to 24 VAC secondary, 20 VA,

Wall Plug

TP-2420

Transformer, 120/208/240 VAC Primary to 24 VAC Secondary,

40 VA, Foot Mount, 8 in. Primary Leads and Secondary Screw

Terminals, Class 2

Note: Additional Y6x-x Series transformers are also available.

Refer to the Series Y63, Y64, Y65, Y66, and Y69 Transformers

Product Bulletin (LIT-125755) for more information.

Y65T31-0

Power transformer (Class 2, 24 VAC, 50 VA maximum output),

no enclosure

AS-XFR050-0

16FX-PCX2721 Expansion Input/Output Module Installation Instructions

Table 9: Accessories Ordering Information

DescriptionProduct Code Number

Replacement SA/FC Bus Terminal Blocks, 4-Position, Gray, Bulk

Pack of 10

Note: This is the standard terminal block that is provided with the

controller.

MS-TBK4BUS-0

Replacement SA Bus Terminal Blocks, 4-Position, Brown, Bulk

Pack of 10

Note: These terminal blocks can be used as replacement parts

if keeping consistent terminal block colors is important.

AP-TBK4SA-0

Replacement FC Bus Terminal Blocks, 4-Position, Blue, Bulk

Pack of 10

Note: These terminal blocks can be used as replacement parts

if keeping consistent terminal block colors is important.

AP-TBK4FC-0

Replacement Power Terminal Blocks, 3-Position, Gray, Bulk Pack

of 10

AP-TBK3PW-0

USB Dongle with ZigBee Driver provides a wireless connection

through FX-PCT to allow wireless commissioning of the wirelessly

enabled FX-PCG, FX-PCA, FX-PCX, and FX-PCV field controllers.

Also allows use of the FX-ZFR Checkout Tool (FX-ZCT) in

FX-PCT.

Note: The ZFR-USBHA-0 replaces the IA OEM DAUBI_2400

ZigBee USB dongle. For additional information on the

ZFR-USBHA-0 ZigBee dongle, refer to the FX-ZFR Series

Wireless Field Bus System Technical Bulletin (LIT-12011660) or

FX-ZFR Series Wireless Field Bus System Quick Reference

Guide (LIT-12011696).

ZFR-USBHA-0

Technical Specifications

Table 10: FX-PCX2721 Technical Specifications

FX-PCX2721-0 Expansion Input/Output ModuleProduct Code Number

24 VAC (nominal, 20 VAC minimum/30 VAC maximum), 50/60 Hz, power supply

Class 2 (North America), Safety Extra-Low Voltage (SELV) (Europe)

Supply Voltage

14 VA maximum for FX-PCX2721 onlyPower Consumption

Operating: 0 to 50°C (32 to 122°F); 10 to 90% RH noncondensing

Storage: -40 to 80°C (-40 to 176°F); 5 to 95% RH noncondensing

Ambient Conditions

DIP switch set; valid controller device addresses 4–127 (Device addresses 0–3 and

128–255 are reserved and not valid controller addresses.)

Addressing

BACnet® MS/TP, RS-485:

3-wire FC Bus between the supervisory controller and other controllers

4-wire SA Bus between controller, network sensors and other sensor/actuator devices,

includes a lead to source 15 VDC supply power (from controller) to bus devices.

Communications Bus

H8SX/166xR Renesas® 32-bit microcontrollerProcessor

640 KB Flash Memory and 128 KB Random Access Memory (RAM)Memory

8 - Universal Inputs: Defined as 0–10 VDC, 4-20 mA, 0-600k ohm, or Binary Dry

Contact

2 - Analog Outputs: Defined as 0–10 VDC or 4-20 mA

Input and Output Capabilities

17FX-PCX2721 Expansion Input/Output Module Installation Instructions

Table 10: FX-PCX2721 Technical Specifications

Output: 16-bit resolution, +/-200 mV accuracy in 0-10 VDC applicationsAnalog Output Resolution and Accuracy

Input/Output: Fixed Screw Terminal Blocks

SA/FC Bus and Supply Power: 4-Wire and 3-Wire Pluggable Screw Terminal

Blocks

SA/FC Bus Port: RJ-12 6-Pin Modular Jacks

Terminations

Horizontal on single 35 mm DIN rail mount (preferred), or screw mount on flat surface

with three integral mounting clips on controller

Mounting

Enclosure material: ABS and polycarbonate UL94 5VB; Self-extinguishing, Plenum

Rated

Protection Class: IP20 (IEC529)

Housing

150 x 164 x 53 mm (5-7/8 x 6-1/2 x 2-1/8 in.) including terminals and mounting clips

Note: Mounting space requires an additional 50 mm (2 in.) on top, bottom and front

face of controller for easy cover removal, ventilation, and wire terminations.

Dimensions(Height x Width x Depth)

0.5 kg (1.1 lb)Weight

United States: UL Listed, File E107041, CCN PAZX, UL 916, Energy Management

Equipment

FCC Compliant to CFR47, Part 15, Subpart B, Class A

Compliance

Canada: UL Listed, File E107041, CCN PAZX7 CAN/CSA C22.2 No.205, Signal

Equipment

Industry Canada Compliant, ICES-003

Europe: Johnson Controls, Inc. declares that this product is in compliance with the

essential requirements and other relevant provisions of the EMC Directive.

Australia and New Zealand: RCM Mark, Australia/NZ Emissions Compliant

BACnet International: BACnet Testing Laboratories (BTL) Protocol Revision 4

Listed BACnet Application Specific Controller (B-ASC)

The performance specifications are nominal and conform to acceptable industry standard. For application at conditions

beyond these specifications, consult the local Johnson Controls® office. Johnson Controls, Inc. shall not be liable

for damages resulting from misapplication or misuse of its products.

APAC Single Point of Contact:NA/SA Single Point of Contact:European Single Point of Contact:

JOHNSON CONTROLS

C/O CONTROLS PRODUCT MANAGEMENT

NO. 22 BLOCK D NEW DISTRICT

WUXI JIANGSU PROVINCE 214142

CHINA

JOHNSON CONTROLS

507 E MICHIGAN ST

MILWAUKEE WI 53202

USA

JOHNSON CONTROLS

WESTENDHOF 3

45143 ESSEN

GERMANY

Building Efficiency

507 E. Michigan Street, Milwaukee, WI 53202

Johnson Controls® is a registered trademark of Johnson Controls, Inc.

www.johnsoncontrols.comPublished in U.S.A.

18FX-PCX2721 Expansion Input/Output Module Installation Instructions

Johnson Controls FX-PCX2721 Installation Instructions Manual

Brand: Johnson Controls

Model: FX-PCX2721

Type: Installation Instructions Manual

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